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Posted to java-user@lucene.apache.org by AlisonCallahan <al...@gmail.com> on 2010/02/17 16:39:02 UTC
PrefixQuery returning 0 results
I have indexed RDF in N-triple format (with three fields -- "subject",
"predicate", "object") and now am trying to query the index with a
PrefixQuery on the "subject" field. My test case is to get back all
documents whose subject field starts with the prefix "<http", and I would
expect to get back all documents. Instead, the PrefixQuery returns 0
documents. I have read and can't see why the PrefixQuery is returning 0
results.
Here is the relevant code:
IndexReader n3reader = IndexReader.open(FSDirectory.open(new File(index)),
true);
Searcher searcher = new IndexSearcher(n3reader);
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
String test = "<http";
Query nsQuery = new PrefixQuery(new Term("subject", test));
TopDocs hits = searcher.search(nsQuery, 10);
System.out.println("Hits: "+hits.totalHits);
This code prints out '0' hits ... Any suggestions for why this isn't
working?? Thanks,
Alison Callahan
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RE: PrefixQuery returning 0 results
Posted by AlisonCallahan <al...@gmail.com>.
Nevermind ... I wrote too soon ... It works!! Thank you Uwe Schindler!
Alison Callahan
AlisonCallahan wrote:
>
> Originally "subject" was indexed with ANALYZED ... I changed it to
> NOT_ANALYZED (there was no "keyword" option for indexing in Lucene 3.0.0),
> and I am still having the same problem.
>
> Thanks,
>
> Alison Callahan
>
>
> Uwe Schindler wrote:
>>
>> How is "subject indexed"?
>>
>> I fit is indexed with ANALYZED not as keyword only, StandardAnalyzer will
>> remove <, lowercase and so on.
>>
>> -----
>> Uwe Schindler
>> H.-H.-Meier-Allee 63, D-28213 Bremen
>> http://www.thetaphi.de
>> eMail: uwe@thetaphi.de
>>
>>
>>> -----Original Message-----
>>> From: AlisonCallahan [mailto:alison.callahan@gmail.com]
>>> Sent: Wednesday, February 17, 2010 4:39 PM
>>> To: java-user@lucene.apache.org
>>> Subject: PrefixQuery returning 0 results
>>>
>>>
>>> I have indexed RDF in N-triple format (with three fields -- "subject",
>>> "predicate", "object") and now am trying to query the index with a
>>> PrefixQuery on the "subject" field. My test case is to get back all
>>> documents whose subject field starts with the prefix "<http", and I
>>> would
>>> expect to get back all documents. Instead, the PrefixQuery returns 0
>>> documents. I have read and can't see why the PrefixQuery is returning 0
>>> results.
>>>
>>> Here is the relevant code:
>>>
>>> IndexReader n3reader = IndexReader.open(FSDirectory.open(new
>>> File(index)),
>>> true);
>>> Searcher searcher = new IndexSearcher(n3reader);
>>> Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
>>>
>>> String test = "<http";
>>>
>>> Query nsQuery = new PrefixQuery(new Term("subject", test));
>>>
>>> TopDocs hits = searcher.search(nsQuery, 10);
>>>
>>> System.out.println("Hits: "+hits.totalHits);
>>>
>>> This code prints out '0' hits ... Any suggestions for why this isn't
>>> working?? Thanks,
>>>
>>> Alison Callahan
>>> --
>>> View this message in context: http://old.nabble.com/PrefixQuery-
>>> returning-0-results-tp27625646p27625646.html
>>> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>>>
>>>
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>>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
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>>
>>
>>
>
>
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RE: PrefixQuery returning 0 results
Posted by AlisonCallahan <al...@gmail.com>.
Originally "subject" was indexed with ANALYZED ... I changed it to
NOT_ANALYZED (there was no "keyword" option for indexing in Lucene 3.0.0),
and I am still having the same problem.
Thanks,
Alison Callahan
Uwe Schindler wrote:
>
> How is "subject indexed"?
>
> I fit is indexed with ANALYZED not as keyword only, StandardAnalyzer will
> remove <, lowercase and so on.
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>
>
>> -----Original Message-----
>> From: AlisonCallahan [mailto:alison.callahan@gmail.com]
>> Sent: Wednesday, February 17, 2010 4:39 PM
>> To: java-user@lucene.apache.org
>> Subject: PrefixQuery returning 0 results
>>
>>
>> I have indexed RDF in N-triple format (with three fields -- "subject",
>> "predicate", "object") and now am trying to query the index with a
>> PrefixQuery on the "subject" field. My test case is to get back all
>> documents whose subject field starts with the prefix "<http", and I
>> would
>> expect to get back all documents. Instead, the PrefixQuery returns 0
>> documents. I have read and can't see why the PrefixQuery is returning 0
>> results.
>>
>> Here is the relevant code:
>>
>> IndexReader n3reader = IndexReader.open(FSDirectory.open(new
>> File(index)),
>> true);
>> Searcher searcher = new IndexSearcher(n3reader);
>> Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
>>
>> String test = "<http";
>>
>> Query nsQuery = new PrefixQuery(new Term("subject", test));
>>
>> TopDocs hits = searcher.search(nsQuery, 10);
>>
>> System.out.println("Hits: "+hits.totalHits);
>>
>> This code prints out '0' hits ... Any suggestions for why this isn't
>> working?? Thanks,
>>
>> Alison Callahan
>> --
>> View this message in context: http://old.nabble.com/PrefixQuery-
>> returning-0-results-tp27625646p27625646.html
>> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>
>
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RE: PrefixQuery returning 0 results
Posted by Uwe Schindler <uw...@thetaphi.de>.
How is "subject indexed"?
I fit is indexed with ANALYZED not as keyword only, StandardAnalyzer will remove <, lowercase and so on.
-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de
> -----Original Message-----
> From: AlisonCallahan [mailto:alison.callahan@gmail.com]
> Sent: Wednesday, February 17, 2010 4:39 PM
> To: java-user@lucene.apache.org
> Subject: PrefixQuery returning 0 results
>
>
> I have indexed RDF in N-triple format (with three fields -- "subject",
> "predicate", "object") and now am trying to query the index with a
> PrefixQuery on the "subject" field. My test case is to get back all
> documents whose subject field starts with the prefix "<http", and I
> would
> expect to get back all documents. Instead, the PrefixQuery returns 0
> documents. I have read and can't see why the PrefixQuery is returning 0
> results.
>
> Here is the relevant code:
>
> IndexReader n3reader = IndexReader.open(FSDirectory.open(new
> File(index)),
> true);
> Searcher searcher = new IndexSearcher(n3reader);
> Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
>
> String test = "<http";
>
> Query nsQuery = new PrefixQuery(new Term("subject", test));
>
> TopDocs hits = searcher.search(nsQuery, 10);
>
> System.out.println("Hits: "+hits.totalHits);
>
> This code prints out '0' hits ... Any suggestions for why this isn't
> working?? Thanks,
>
> Alison Callahan
> --
> View this message in context: http://old.nabble.com/PrefixQuery-
> returning-0-results-tp27625646p27625646.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
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